1. What is a Three Phase kVA Calculator?

Definition: This calculator determines the apparent power (kVA) in a three-phase electrical system based on voltage and current.

Purpose: It helps electrical engineers, technicians, and electricians properly size equipment and understand power requirements in three-phase systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{kVA} \) — Apparent power (kilovolt-amperes)
• \( V \) — Line-to-line voltage (volts)
• \( I \) — Current (amperes)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for the phase difference in three-phase systems by including the √3 factor.

3. Importance of kVA Calculation

Details: Proper kVA calculation ensures correct sizing of transformers, generators, circuit breakers, and other electrical equipment.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts and the current in amperes. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kVA and kW?
A: kVA is apparent power (volts × amps), while kW is real power (kVA × power factor). kVA includes both working and reactive power.

Q2: Is this for line-to-line or line-to-neutral voltage?
A: The formula uses line-to-line voltage (phase-to-phase voltage).

Q3: Why is √3 used in three-phase calculations?
A: It accounts for the 120° phase difference between the three phases in a balanced system.

Q4: Can I use this for single-phase systems?
A: No, for single-phase use kVA = (V × I)/1000 (without the √3 factor).

Q5: How does power factor affect this calculation?
A: Power factor doesn't affect kVA but does affect kW (real power). Lower power factor means more current for the same real power.